
#include <stdio.h>
#include <string.h>           /* memcpy, memcmp */
#include "be_des.h"


namespace be{

static const s8 *selftest_failed = NULL;

static u8 * PADDING[] = {
    (u8 *)"", 
    (u8 *)"\01",
    (u8 *)"\02\02",
    (u8 *)"\03\03\03",
    (u8 *)"\04\04\04\04",
    (u8 *)"\05\05\05\05\05",
    (u8 *)"\06\06\06\06\06\06",
    (u8 *)"\07\07\07\07\07\07\07",
    (u8 *)"\010\010\010\010\010\010\010\010"
};


/*
 * The s-box values are permuted according to the 'primitive function P'
 * and are rotated one bit to the left.
 */
static u32 sbox1[64] =
{
  0x01010400, 0x00000000, 0x00010000, 0x01010404, 0x01010004, 0x00010404, 0x00000004, 0x00010000,
  0x00000400, 0x01010400, 0x01010404, 0x00000400, 0x01000404, 0x01010004, 0x01000000, 0x00000004,
  0x00000404, 0x01000400, 0x01000400, 0x00010400, 0x00010400, 0x01010000, 0x01010000, 0x01000404,
  0x00010004, 0x01000004, 0x01000004, 0x00010004, 0x00000000, 0x00000404, 0x00010404, 0x01000000,
  0x00010000, 0x01010404, 0x00000004, 0x01010000, 0x01010400, 0x01000000, 0x01000000, 0x00000400,
  0x01010004, 0x00010000, 0x00010400, 0x01000004, 0x00000400, 0x00000004, 0x01000404, 0x00010404,
  0x01010404, 0x00010004, 0x01010000, 0x01000404, 0x01000004, 0x00000404, 0x00010404, 0x01010400,
  0x00000404, 0x01000400, 0x01000400, 0x00000000, 0x00010004, 0x00010400, 0x00000000, 0x01010004
};

static u32 sbox2[64] =
{
  0x80108020, 0x80008000, 0x00008000, 0x00108020, 0x00100000, 0x00000020, 0x80100020, 0x80008020,
  0x80000020, 0x80108020, 0x80108000, 0x80000000, 0x80008000, 0x00100000, 0x00000020, 0x80100020,
  0x00108000, 0x00100020, 0x80008020, 0x00000000, 0x80000000, 0x00008000, 0x00108020, 0x80100000,
  0x00100020, 0x80000020, 0x00000000, 0x00108000, 0x00008020, 0x80108000, 0x80100000, 0x00008020,
  0x00000000, 0x00108020, 0x80100020, 0x00100000, 0x80008020, 0x80100000, 0x80108000, 0x00008000,
  0x80100000, 0x80008000, 0x00000020, 0x80108020, 0x00108020, 0x00000020, 0x00008000, 0x80000000,
  0x00008020, 0x80108000, 0x00100000, 0x80000020, 0x00100020, 0x80008020, 0x80000020, 0x00100020,
  0x00108000, 0x00000000, 0x80008000, 0x00008020, 0x80000000, 0x80100020, 0x80108020, 0x00108000
};

static u32 sbox3[64] =
{
  0x00000208, 0x08020200, 0x00000000, 0x08020008, 0x08000200, 0x00000000, 0x00020208, 0x08000200,
  0x00020008, 0x08000008, 0x08000008, 0x00020000, 0x08020208, 0x00020008, 0x08020000, 0x00000208,
  0x08000000, 0x00000008, 0x08020200, 0x00000200, 0x00020200, 0x08020000, 0x08020008, 0x00020208,
  0x08000208, 0x00020200, 0x00020000, 0x08000208, 0x00000008, 0x08020208, 0x00000200, 0x08000000,
  0x08020200, 0x08000000, 0x00020008, 0x00000208, 0x00020000, 0x08020200, 0x08000200, 0x00000000,
  0x00000200, 0x00020008, 0x08020208, 0x08000200, 0x08000008, 0x00000200, 0x00000000, 0x08020008,
  0x08000208, 0x00020000, 0x08000000, 0x08020208, 0x00000008, 0x00020208, 0x00020200, 0x08000008,
  0x08020000, 0x08000208, 0x00000208, 0x08020000, 0x00020208, 0x00000008, 0x08020008, 0x00020200
};

static u32 sbox4[64] =
{
  0x00802001, 0x00002081, 0x00002081, 0x00000080, 0x00802080, 0x00800081, 0x00800001, 0x00002001,
  0x00000000, 0x00802000, 0x00802000, 0x00802081, 0x00000081, 0x00000000, 0x00800080, 0x00800001,
  0x00000001, 0x00002000, 0x00800000, 0x00802001, 0x00000080, 0x00800000, 0x00002001, 0x00002080,
  0x00800081, 0x00000001, 0x00002080, 0x00800080, 0x00002000, 0x00802080, 0x00802081, 0x00000081,
  0x00800080, 0x00800001, 0x00802000, 0x00802081, 0x00000081, 0x00000000, 0x00000000, 0x00802000,
  0x00002080, 0x00800080, 0x00800081, 0x00000001, 0x00802001, 0x00002081, 0x00002081, 0x00000080,
  0x00802081, 0x00000081, 0x00000001, 0x00002000, 0x00800001, 0x00002001, 0x00802080, 0x00800081,
  0x00002001, 0x00002080, 0x00800000, 0x00802001, 0x00000080, 0x00800000, 0x00002000, 0x00802080
};

static u32 sbox5[64] =
{
  0x00000100, 0x02080100, 0x02080000, 0x42000100, 0x00080000, 0x00000100, 0x40000000, 0x02080000,
  0x40080100, 0x00080000, 0x02000100, 0x40080100, 0x42000100, 0x42080000, 0x00080100, 0x40000000,
  0x02000000, 0x40080000, 0x40080000, 0x00000000, 0x40000100, 0x42080100, 0x42080100, 0x02000100,
  0x42080000, 0x40000100, 0x00000000, 0x42000000, 0x02080100, 0x02000000, 0x42000000, 0x00080100,
  0x00080000, 0x42000100, 0x00000100, 0x02000000, 0x40000000, 0x02080000, 0x42000100, 0x40080100,
  0x02000100, 0x40000000, 0x42080000, 0x02080100, 0x40080100, 0x00000100, 0x02000000, 0x42080000,
  0x42080100, 0x00080100, 0x42000000, 0x42080100, 0x02080000, 0x00000000, 0x40080000, 0x42000000,
  0x00080100, 0x02000100, 0x40000100, 0x00080000, 0x00000000, 0x40080000, 0x02080100, 0x40000100
};

static u32 sbox6[64] =
{
  0x20000010, 0x20400000, 0x00004000, 0x20404010, 0x20400000, 0x00000010, 0x20404010, 0x00400000,
  0x20004000, 0x00404010, 0x00400000, 0x20000010, 0x00400010, 0x20004000, 0x20000000, 0x00004010,
  0x00000000, 0x00400010, 0x20004010, 0x00004000, 0x00404000, 0x20004010, 0x00000010, 0x20400010,
  0x20400010, 0x00000000, 0x00404010, 0x20404000, 0x00004010, 0x00404000, 0x20404000, 0x20000000,
  0x20004000, 0x00000010, 0x20400010, 0x00404000, 0x20404010, 0x00400000, 0x00004010, 0x20000010,
  0x00400000, 0x20004000, 0x20000000, 0x00004010, 0x20000010, 0x20404010, 0x00404000, 0x20400000,
  0x00404010, 0x20404000, 0x00000000, 0x20400010, 0x00000010, 0x00004000, 0x20400000, 0x00404010,
  0x00004000, 0x00400010, 0x20004010, 0x00000000, 0x20404000, 0x20000000, 0x00400010, 0x20004010
};

static u32 sbox7[64] =
{
  0x00200000, 0x04200002, 0x04000802, 0x00000000, 0x00000800, 0x04000802, 0x00200802, 0x04200800,
  0x04200802, 0x00200000, 0x00000000, 0x04000002, 0x00000002, 0x04000000, 0x04200002, 0x00000802,
  0x04000800, 0x00200802, 0x00200002, 0x04000800, 0x04000002, 0x04200000, 0x04200800, 0x00200002,
  0x04200000, 0x00000800, 0x00000802, 0x04200802, 0x00200800, 0x00000002, 0x04000000, 0x00200800,
  0x04000000, 0x00200800, 0x00200000, 0x04000802, 0x04000802, 0x04200002, 0x04200002, 0x00000002,
  0x00200002, 0x04000000, 0x04000800, 0x00200000, 0x04200800, 0x00000802, 0x00200802, 0x04200800,
  0x00000802, 0x04000002, 0x04200802, 0x04200000, 0x00200800, 0x00000000, 0x00000002, 0x04200802,
  0x00000000, 0x00200802, 0x04200000, 0x00000800, 0x04000002, 0x04000800, 0x00000800, 0x00200002
};

static u32 sbox8[64] =
{
  0x10001040, 0x00001000, 0x00040000, 0x10041040, 0x10000000, 0x10001040, 0x00000040, 0x10000000,
  0x00040040, 0x10040000, 0x10041040, 0x00041000, 0x10041000, 0x00041040, 0x00001000, 0x00000040,
  0x10040000, 0x10000040, 0x10001000, 0x00001040, 0x00041000, 0x00040040, 0x10040040, 0x10041000,
  0x00001040, 0x00000000, 0x00000000, 0x10040040, 0x10000040, 0x10001000, 0x00041040, 0x00040000,
  0x00041040, 0x00040000, 0x10041000, 0x00001000, 0x00000040, 0x10040040, 0x00001000, 0x00041040,
  0x10001000, 0x00000040, 0x10000040, 0x10040000, 0x10040040, 0x10000000, 0x00040000, 0x10001040,
  0x00000000, 0x10041040, 0x00040040, 0x10000040, 0x10040000, 0x10001000, 0x10001040, 0x00000000,
  0x10041040, 0x00041000, 0x00041000, 0x00001040, 0x00001040, 0x00040040, 0x10000000, 0x10041000
};


/*
 * These two tables are part of the 'permuted choice 1' function.
 * In this implementation several speed improvements are done.
 */
u32 leftkey_swap[16] =
{
  0x00000000, 0x00000001, 0x00000100, 0x00000101,
  0x00010000, 0x00010001, 0x00010100, 0x00010101,
  0x01000000, 0x01000001, 0x01000100, 0x01000101,
  0x01010000, 0x01010001, 0x01010100, 0x01010101
};

u32 rightkey_swap[16] =
{
  0x00000000, 0x01000000, 0x00010000, 0x01010000,
  0x00000100, 0x01000100, 0x00010100, 0x01010100,
  0x00000001, 0x01000001, 0x00010001, 0x01010001,
  0x00000101, 0x01000101, 0x00010101, 0x01010101,
};



/*
 * Numbers of left shifts per round for encryption subkeys.
 * To calculate the decryption subkeys we just reverse the
 * ordering of the calculated encryption subkeys. So their
 * is no need for a decryption rotate tab.
 */
static u8 encrypt_rotate_tab[16] =
{
  1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
};



/*
 * Table with weak DES keys sorted in ascending order.
 * In DES their are 64 known keys wich are weak. They are weak
 * because they produce only one, two or four different
 * subkeys in the subkey scheduling process.
 * The keys in this table have all their parity bits cleared.
 */
static u8 weak_keys[64][8] =
{
  { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },  { 0x00, 0x00, 0x1e, 0x1e, 0x00, 0x00, 0x0e, 0x0e },
  { 0x00, 0x00, 0xe0, 0xe0, 0x00, 0x00, 0xf0, 0xf0 },  { 0x00, 0x00, 0xfe, 0xfe, 0x00, 0x00, 0xfe, 0xfe },
  { 0x00, 0x1e, 0x00, 0x1e, 0x00, 0x0e, 0x00, 0x0e },  { 0x00, 0x1e, 0x1e, 0x00, 0x00, 0x0e, 0x0e, 0x00 },
  { 0x00, 0x1e, 0xe0, 0xfe, 0x00, 0x0e, 0xf0, 0xfe },  { 0x00, 0x1e, 0xfe, 0xe0, 0x00, 0x0e, 0xfe, 0xf0 },
  { 0x00, 0xe0, 0x00, 0xe0, 0x00, 0xf0, 0x00, 0xf0 },  { 0x00, 0xe0, 0x1e, 0xfe, 0x00, 0xf0, 0x0e, 0xfe },
  { 0x00, 0xe0, 0xe0, 0x00, 0x00, 0xf0, 0xf0, 0x00 },  { 0x00, 0xe0, 0xfe, 0x1e, 0x00, 0xf0, 0xfe, 0x0e },
  { 0x00, 0xfe, 0x00, 0xfe, 0x00, 0xfe, 0x00, 0xfe },  { 0x00, 0xfe, 0x1e, 0xe0, 0x00, 0xfe, 0x0e, 0xf0 },
  { 0x00, 0xfe, 0xe0, 0x1e, 0x00, 0xfe, 0xf0, 0x0e },  { 0x00, 0xfe, 0xfe, 0x00, 0x00, 0xfe, 0xfe, 0x00 },
  { 0x0e, 0x0e, 0x0e, 0x0e, 0xf0, 0xf0, 0xf0, 0xf0 },  { 0x1e, 0x00, 0x00, 0x1e, 0x0e, 0x00, 0x00, 0x0e },
  { 0x1e, 0x00, 0x1e, 0x00, 0x0e, 0x00, 0x0e, 0x00 },  { 0x1e, 0x00, 0xe0, 0xfe, 0x0e, 0x00, 0xf0, 0xfe },
  { 0x1e, 0x00, 0xfe, 0xe0, 0x0e, 0x00, 0xfe, 0xf0 },  { 0x1e, 0x1e, 0x00, 0x00, 0x0e, 0x0e, 0x00, 0x00 },
  { 0x1e, 0x1e, 0x1e, 0x1e, 0x0e, 0x0e, 0x0e, 0x0e },  { 0x1e, 0x1e, 0xe0, 0xe0, 0x0e, 0x0e, 0xf0, 0xf0 },
  { 0x1e, 0x1e, 0xfe, 0xfe, 0x0e, 0x0e, 0xfe, 0xfe },  { 0x1e, 0xe0, 0x00, 0xfe, 0x0e, 0xf0, 0x00, 0xfe },
  { 0x1e, 0xe0, 0x1e, 0xe0, 0x0e, 0xf0, 0x0e, 0xf0 },  { 0x1e, 0xe0, 0xe0, 0x1e, 0x0e, 0xf0, 0xf0, 0x0e },
  { 0x1e, 0xe0, 0xfe, 0x00, 0x0e, 0xf0, 0xfe, 0x00 },  { 0x1e, 0xfe, 0x00, 0xe0, 0x0e, 0xfe, 0x00, 0xf0 },
  { 0x1e, 0xfe, 0x1e, 0xfe, 0x0e, 0xfe, 0x0e, 0xfe },  { 0x1e, 0xfe, 0xe0, 0x00, 0x0e, 0xfe, 0xf0, 0x00 },
  { 0x1e, 0xfe, 0xfe, 0x1e, 0x0e, 0xfe, 0xfe, 0x0e },  { 0xe0, 0x00, 0x00, 0xe0, 0xf0, 0x00, 0x00, 0xf0 },
  { 0xe0, 0x00, 0x1e, 0xfe, 0xf0, 0x00, 0x0e, 0xfe },  { 0xe0, 0x00, 0xe0, 0x00, 0xf0, 0x00, 0xf0, 0x00 },
  { 0xe0, 0x00, 0xfe, 0x1e, 0xf0, 0x00, 0xfe, 0x0e },  { 0xe0, 0x1e, 0x00, 0xfe, 0xf0, 0x0e, 0x00, 0xfe },
  { 0xe0, 0x1e, 0x1e, 0xe0, 0xf0, 0x0e, 0x0e, 0xf0 },  { 0xe0, 0x1e, 0xe0, 0x1e, 0xf0, 0x0e, 0xf0, 0x0e },
  { 0xe0, 0x1e, 0xfe, 0x00, 0xf0, 0x0e, 0xfe, 0x00 },  { 0xe0, 0xe0, 0x00, 0x00, 0xf0, 0xf0, 0x00, 0x00 },
  { 0xe0, 0xe0, 0x1e, 0x1e, 0xf0, 0xf0, 0x0e, 0x0e },  { 0xe0, 0xe0, 0xfe, 0xfe, 0xf0, 0xf0, 0xfe, 0xfe },
  { 0xe0, 0xfe, 0x00, 0x1e, 0xf0, 0xfe, 0x00, 0x0e },  { 0xe0, 0xfe, 0x1e, 0x00, 0xf0, 0xfe, 0x0e, 0x00 },
  { 0xe0, 0xfe, 0xe0, 0xfe, 0xf0, 0xfe, 0xf0, 0xfe },  { 0xe0, 0xfe, 0xfe, 0xe0, 0xf0, 0xfe, 0xfe, 0xf0 },
  { 0xfe, 0x00, 0x00, 0xfe, 0xfe, 0x00, 0x00, 0xfe },  { 0xfe, 0x00, 0x1e, 0xe0, 0xfe, 0x00, 0x0e, 0xf0 },
  { 0xfe, 0x00, 0xe0, 0x1e, 0xfe, 0x00, 0xf0, 0x0e },  { 0xfe, 0x00, 0xfe, 0x00, 0xfe, 0x00, 0xfe, 0x00 },
  { 0xfe, 0x1e, 0x00, 0xe0, 0xfe, 0x0e, 0x00, 0xf0 },  { 0xfe, 0x1e, 0x1e, 0xfe, 0xfe, 0x0e, 0x0e, 0xfe },
  { 0xfe, 0x1e, 0xe0, 0x00, 0xfe, 0x0e, 0xf0, 0x00 },  { 0xfe, 0x1e, 0xfe, 0x1e, 0xfe, 0x0e, 0xfe, 0x0e },
  { 0xfe, 0xe0, 0x00, 0x1e, 0xfe, 0xf0, 0x00, 0x0e },  { 0xfe, 0xe0, 0x1e, 0x00, 0xfe, 0xf0, 0x0e, 0x00 },
  { 0xfe, 0xe0, 0xe0, 0xfe, 0xfe, 0xf0, 0xf0, 0xfe },  { 0xfe, 0xe0, 0xfe, 0xe0, 0xfe, 0xf0, 0xfe, 0xf0 },
  { 0xfe, 0xfe, 0x00, 0x00, 0xfe, 0xfe, 0x00, 0x00 },  { 0xfe, 0xfe, 0x1e, 0x1e, 0xfe, 0xfe, 0x0e, 0x0e },
  { 0xfe, 0xfe, 0xe0, 0xe0, 0xfe, 0xfe, 0xf0, 0xf0 },  { 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe, 0xfe }
};






/*
 * Macro to swap bits across two words.
 */
#define DO_PERMUTATION(a, temp, b, offset, mask)    \
    temp = ((a>>offset) ^ b) & mask;            \
    b ^= temp;                        \
    a ^= temp<<offset;


/*
 * This performs the 'initial permutation' of the data to be encrypted
 * or decrypted. Additionally the resulting two words are rotated one bit
 * to the left.
 */
#define INITIAL_PERMUTATION(left, temp, right)        \
    DO_PERMUTATION(left, temp, right, 4, 0x0f0f0f0f)    \
    DO_PERMUTATION(left, temp, right, 16, 0x0000ffff)    \
    DO_PERMUTATION(right, temp, left, 2, 0x33333333)    \
    DO_PERMUTATION(right, temp, left, 8, 0x00ff00ff)    \
    right =  (right << 1) | (right >> 31);        \
    temp  =  (left ^ right) & 0xaaaaaaaa;        \
    right ^= temp;                    \
    left  ^= temp;                    \
    left  =  (left << 1) | (left >> 31);

/*
 * The 'inverse initial permutation'.
 */
#define FINAL_PERMUTATION(left, temp, right)        \
    left  =  (left << 31) | (left >> 1);        \
    temp  =  (left ^ right) & 0xaaaaaaaa;        \
    left  ^= temp;                    \
    right ^= temp;                    \
    right  =  (right << 31) | (right >> 1);        \
    DO_PERMUTATION(right, temp, left, 8, 0x00ff00ff)    \
    DO_PERMUTATION(right, temp, left, 2, 0x33333333)    \
    DO_PERMUTATION(left, temp, right, 16, 0x0000ffff)    \
    DO_PERMUTATION(left, temp, right, 4, 0x0f0f0f0f)


/*
 * A full DES round including 'expansion function', 'sbox substitution'
 * and 'primitive function P' but without swapping the left and right word.
 * Please note: The data in 'from' and 'to' is already rotated one bit to
 * the left, done in the initial permutation.
 */
#define DES_ROUND(from, to, work, subkey)        \
    work = from ^ *subkey++;                \
    to ^= sbox8[  work        & 0x3f ];            \
    to ^= sbox6[ (work>>8)  & 0x3f ];            \
    to ^= sbox4[ (work>>16) & 0x3f ];            \
    to ^= sbox2[ (work>>24) & 0x3f ];            \
    work = ((from << 28) | (from >> 4)) ^ *subkey++;    \
    to ^= sbox7[  work        & 0x3f ];            \
    to ^= sbox5[ (work>>8)  & 0x3f ];            \
    to ^= sbox3[ (work>>16) & 0x3f ];            \
    to ^= sbox1[ (work>>24) & 0x3f ];

/*
 * Macros to convert 8 bytes from/to 32bit words.
 */
#define READ_64BIT_DATA(data, left, right)                    \
    left  = (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];    \
    right = (data[4] << 24) | (data[5] << 16) | (data[6] << 8) | data[7];

#define WRITE_64BIT_DATA(data, left, right)                    \
    data[0] = (u8)(left >> 24) & 0xff;  data[1] = (u8)(left >> 16) & 0xff;         \
    data[2] = (u8)(left >> 8) & 0xff;   data[3] = (u8)left & 0xff;                \
    data[4] = (u8)(right >> 24) & 0xff; data[5] = (u8)(right >> 16) & 0xff;        \
    data[6] = (u8)(right >> 8) & 0xff;  data[7] = (u8)right & 0xff;


void burn_stack (s32 bytes)
{
    s8 buf[64];
    
    memset (buf, 0, sizeof buf);
    bytes -= sizeof buf;
    if (bytes > 0)
        burn_stack (bytes);
}

/*
 * des_key_schedule():      Calculate 16 subkeys pairs (even/odd) for
 *              16 encryption rounds.
 *              To calculate subkeys for decryption the caller
 *              have to reorder the generated subkeys.
 *
 *    rawkey:        8 Bytes of key data
 *    subkey:        Array of at least 32 u32s. Will be filled
 *            with calculated subkeys.
 *
 */
void des_key_schedule (u8 * rawkey, u32 * subkey)
{
  u32 left, right, work;
  s32 round;

  READ_64BIT_DATA (rawkey, left, right)

  DO_PERMUTATION (right, work, left, 4, 0x0f0f0f0f)
  DO_PERMUTATION (right, work, left, 0, 0x10101010)

  left = (leftkey_swap[(left >> 0) & 0xf] << 3) | (leftkey_swap[(left >> 8) & 0xf] << 2)
    | (leftkey_swap[(left >> 16) & 0xf] << 1) | (leftkey_swap[(left >> 24) & 0xf])
    | (leftkey_swap[(left >> 5) & 0xf] << 7) | (leftkey_swap[(left >> 13) & 0xf] << 6)
    | (leftkey_swap[(left >> 21) & 0xf] << 5) | (leftkey_swap[(left >> 29) & 0xf] << 4);

  left &= 0x0fffffff;

  right = (rightkey_swap[(right >> 1) & 0xf] << 3) | (rightkey_swap[(right >> 9) & 0xf] << 2)
    | (rightkey_swap[(right >> 17) & 0xf] << 1) | (rightkey_swap[(right >> 25) & 0xf])
    | (rightkey_swap[(right >> 4) & 0xf] << 7) | (rightkey_swap[(right >> 12) & 0xf] << 6)
    | (rightkey_swap[(right >> 20) & 0xf] << 5) | (rightkey_swap[(right >> 28) & 0xf] << 4);

  right &= 0x0fffffff;

  for (round = 0; round < 16; ++round)
    {
      left = ((left << encrypt_rotate_tab[round]) | (left >> (28 - encrypt_rotate_tab[round]))) & 0x0fffffff;
      right = ((right << encrypt_rotate_tab[round]) | (right >> (28 - encrypt_rotate_tab[round]))) & 0x0fffffff;

      *subkey++ = ((left << 4) & 0x24000000)
    | ((left << 28) & 0x10000000)
    | ((left << 14) & 0x08000000)
    | ((left << 18) & 0x02080000)
    | ((left << 6) & 0x01000000)
    | ((left << 9) & 0x00200000)
    | ((left >> 1) & 0x00100000)
    | ((left << 10) & 0x00040000)
    | ((left << 2) & 0x00020000)
    | ((left >> 10) & 0x00010000)
    | ((right >> 13) & 0x00002000)
    | ((right >> 4) & 0x00001000)
    | ((right << 6) & 0x00000800)
    | ((right >> 1) & 0x00000400)
    | ((right >> 14) & 0x00000200)
    | (right & 0x00000100)
    | ((right >> 5) & 0x00000020)
    | ((right >> 10) & 0x00000010)
    | ((right >> 3) & 0x00000008)
    | ((right >> 18) & 0x00000004)
    | ((right >> 26) & 0x00000002)
    | ((right >> 24) & 0x00000001);

      *subkey++ = ((left << 15) & 0x20000000)
    | ((left << 17) & 0x10000000)
    | ((left << 10) & 0x08000000)
    | ((left << 22) & 0x04000000)
    | ((left >> 2) & 0x02000000)
    | ((left << 1) & 0x01000000)
    | ((left << 16) & 0x00200000)
    | ((left << 11) & 0x00100000)
    | ((left << 3) & 0x00080000)
    | ((left >> 6) & 0x00040000)
    | ((left << 15) & 0x00020000)
    | ((left >> 4) & 0x00010000)
    | ((right >> 2) & 0x00002000)
    | ((right << 8) & 0x00001000)
    | ((right >> 14) & 0x00000808)
    | ((right >> 9) & 0x00000400)
    | ((right) & 0x00000200)
    | ((right << 7) & 0x00000100)
    | ((right >> 7) & 0x00000020)
    | ((right >> 3) & 0x00000011)
    | ((right << 2) & 0x00000004)
    | ((right >> 21) & 0x00000002);
    }
}



/*
 * Fill a DES context with subkeys calculated from a 64bit key.
 * Does not check parity bits, but simply ignore them.
 * Does not check for weak keys.
 */
s32 des_setkey (struct _des_ctx *ctx, u8 * key)
{
    s32 i;

    if( selftest_failed )
        return DESE_SELFTEST_FAILED;

    des_key_schedule (key, ctx->encrypt_subkeys);
    burn_stack (32);

    for(i=0; i<32; i+=2) {
        ctx->decrypt_subkeys[i]    = ctx->encrypt_subkeys[30-i];
        ctx->decrypt_subkeys[i+1] = ctx->encrypt_subkeys[31-i];
    }

    return 0;
}



/*
 * Electronic Codebook Mode DES encryption/decryption of data according
 * to 'mode'.
 */
s32 des_ecb_crypt (struct _des_ctx * ctx, u8 * from, u8 * to, s32 mode)
{
    u32 left, right, work;
    u32 *keys;

    keys = mode ? ctx->decrypt_subkeys : ctx->encrypt_subkeys;

    READ_64BIT_DATA (from, left, right)
    INITIAL_PERMUTATION (left, work, right)

    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
    DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)

    FINAL_PERMUTATION (right, work, left)
    WRITE_64BIT_DATA (to, right, left)

    return 0;
}



/*
 * Fill a Triple-DES context with subkeys calculated from two 64bit keys.
 * Does not check the parity bits of the keys, but simply ignore them.
 * Does not check for weak keys.
 */
s32 tripledes_set2keys (struct _tripledes_ctx *ctx,
            u8 * key1,
            u8 * key2)
{
  s32 i;

  des_key_schedule (key1, ctx->encrypt_subkeys);
  des_key_schedule (key2, &(ctx->decrypt_subkeys[32]));
  burn_stack (32);

  for(i=0; i<32; i+=2)
    {
      ctx->decrypt_subkeys[i]     = ctx->encrypt_subkeys[30-i];
      ctx->decrypt_subkeys[i+1]  = ctx->encrypt_subkeys[31-i];

      ctx->encrypt_subkeys[i+32] = ctx->decrypt_subkeys[62-i];
      ctx->encrypt_subkeys[i+33] = ctx->decrypt_subkeys[63-i];

      ctx->encrypt_subkeys[i+64] = ctx->encrypt_subkeys[i];
      ctx->encrypt_subkeys[i+65] = ctx->encrypt_subkeys[i+1];

      ctx->decrypt_subkeys[i+64] = ctx->decrypt_subkeys[i];
      ctx->decrypt_subkeys[i+65] = ctx->decrypt_subkeys[i+1];
    }

  return 0;
}



/*
 * Fill a Triple-DES context with subkeys calculated from three 64bit keys.
 * Does not check the parity bits of the keys, but simply ignore them.
 * Does not check for weak keys.
 */
s32 tripledes_set3keys (struct _tripledes_ctx *ctx,
            u8 * key1,
            u8 * key2,
            u8 * key3)
{
  s32 i;

  des_key_schedule (key1, ctx->encrypt_subkeys);
  des_key_schedule (key2, &(ctx->decrypt_subkeys[32]));
  des_key_schedule (key3, &(ctx->encrypt_subkeys[64]));
  burn_stack (32);

  for(i=0; i<32; i+=2)
    {
      ctx->decrypt_subkeys[i]     = ctx->encrypt_subkeys[94-i];
      ctx->decrypt_subkeys[i+1]  = ctx->encrypt_subkeys[95-i];

      ctx->encrypt_subkeys[i+32] = ctx->decrypt_subkeys[62-i];
      ctx->encrypt_subkeys[i+33] = ctx->decrypt_subkeys[63-i];

      ctx->decrypt_subkeys[i+64] = ctx->encrypt_subkeys[30-i];
      ctx->decrypt_subkeys[i+65] = ctx->encrypt_subkeys[31-i];
    }

  return 0;
}



/*
 * Electronic Codebook Mode Triple-DES encryption/decryption of data according to 'mode'.
 * Sometimes this mode is named 'EDE' mode (Encryption-Decryption-Encryption).
 */
s32 tripledes_ecb_crypt (struct _tripledes_ctx *ctx, u8 * from, u8 * to, s32 mode)
{
  u32 left, right, work;
  u32 *keys;

  keys = mode ? ctx->decrypt_subkeys : ctx->encrypt_subkeys;

  READ_64BIT_DATA (from, left, right)
  INITIAL_PERMUTATION (left, work, right)

  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)

  DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
  DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
  DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
  DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
  DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
  DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
  DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)
  DES_ROUND (left, right, work, keys) DES_ROUND (right, left, work, keys)

  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)
  DES_ROUND (right, left, work, keys) DES_ROUND (left, right, work, keys)

  FINAL_PERMUTATION (right, work, left)
  WRITE_64BIT_DATA (to, right, left)

  return 0;
}





/*
 * Check whether the 8 u8 key is weak.
 * Dose not check the parity bits of the key but simple ignore them.
 */
s32 is_weak_key ( u8 *key )
{
  u8 work[8];
  s32 i, left, right, middle, cmp_result;

  /* clear parity bits */
  for(i=0; i<8; ++i)
     work[i] = key[i] & 0xfe;

  /* binary search in the weak key table */
  left = 0;
  right = 63;
  while(left <= right)
    {
      middle = (left + right) / 2;

      if ( !(cmp_result=memcmp(work, weak_keys[middle], 8)) )
      return -1;

      if ( cmp_result > 0 )
      left = middle + 1;
      else
      right = middle - 1;
    }

  return 0;
}




s32 DesSetKey (void * ctx, u8 * key)
{
    return des_setkey((DesCtx *)ctx, key);
}

s32 DesEncrypt (void * vctx, u8 * inbuf, s32 len, u8 * outbuf, s32 * poutlen)
{
    DesCtx  * ctx = (DesCtx *)vctx;
    s32 groups, bnum, padlen, remaining;
    s32 i;
    u8  buf[8];

    if (!ctx || !inbuf || !outbuf || !poutlen)
        return -1;

    *poutlen = 8 * (len/8 + 1);
    groups = len/8;
    remaining = len % 8;
    padlen = *poutlen - len;

    bnum = 0;
    for (i = 0; i < groups; i++) {
        des_ecb_crypt (ctx, inbuf + bnum, outbuf + bnum, 0);
        bnum += 8;
    }

    if (remaining)
        memcpy(buf, &inbuf[bnum], remaining);
    memcpy(&buf[remaining], PADDING[padlen], padlen);
    des_ecb_crypt (ctx, buf, outbuf + bnum, 0);
    bnum += 8;

    return 0;
}

s32 DesDecrypt (void * vctx, u8 * inbuf, s32 len, u8 * outbuf, s32 * poutlen)
{
    DesCtx  * ctx = (DesCtx *)vctx;
    s32 groups, bnum, padlen;
    s32 i;
    u8 buf[8];

    if (!ctx || !inbuf || !outbuf || !poutlen)
        return -1;
    if (len % 8) return -1;

    bnum = 0;
    groups = len/8 - 1;
    for (i = 0; i < groups; i++) {
        des_ecb_crypt(ctx, inbuf+bnum, outbuf+bnum, 1);
        bnum += 8;
    }

    if (len - bnum != 8) return -1;
    des_ecb_crypt(ctx, inbuf+bnum, buf, 1);
    padlen = buf[7];
    if (padlen == 0 || padlen > 8)
        return -1;

    if (memcmp(&buf[8-padlen], PADDING[padlen], padlen) != 0) {
        return -1;
    }
    memcpy(outbuf+bnum, buf, 8-padlen);
    bnum += 8 - padlen;

    *poutlen = bnum;
    return 0;
}


s32 Des3Set2Key ( TripleDesCtx * ctx, u8 * key, u32 keylen )
{
    if( keylen != 16 )
        return DESE_WRONG_KEYLEN;

    tripledes_set2keys ( ctx, key, key+8);

    if( is_weak_key( key ) || is_weak_key( key+8 ) ) {
        return DESE_WEAK_KEY;
    }

    return 0;
}

s32 Des3Set3Key ( TripleDesCtx * ctx, u8 * key, u32 keylen )
{
    if( keylen != 24 )
        return DESE_WRONG_KEYLEN;

    tripledes_set3keys ( ctx, key, key+8, key+16);

    if( is_weak_key( key ) || is_weak_key( key+8 ) || is_weak_key( key+16 ) ) {
        burn_stack (64);
        return DESE_WEAK_KEY;
    }
    burn_stack (64); 

    return 0;
}


s32 Des3Encrypt (TripleDesCtx * ctx, u8 * inbuf, s32 len, u8 * outbuf, s32 * poutlen)
{
    s32 groups, bnum, padlen, remaining;
    s32 i;
    u8  buf[8];

    if (!ctx || !inbuf || !outbuf || !poutlen)
        return -1;

    *poutlen = 8 * (len/8 + 1);
    groups = len/8;
    remaining = len % 8;
    padlen = *poutlen - len;

    bnum = 0;
    for (i = 0; i < groups; i++) {
        tripledes_ecb_crypt (ctx, inbuf + bnum, outbuf + bnum, 0);
        bnum += 8;
    }

    if (remaining)
        memcpy(buf, &inbuf[bnum], remaining);
    memcpy(&buf[remaining], PADDING[padlen], padlen);
    tripledes_ecb_crypt (ctx, buf, outbuf + bnum, 0);
    bnum += 8;

    return 0;
}

s32 Des3Decrypt (TripleDesCtx * ctx, u8 * inbuf, s32 len, u8 * outbuf, s32 * poutlen)
{
    s32 groups, bnum, padlen;
    s32 i;
    u8 buf[8];

    if (!ctx || !inbuf || !outbuf || !poutlen)
        return -1;
    if (len % 8) return -1;

    bnum = 0;
    groups = len/8 - 1;
    for (i = 0; i < groups; i++) {
        tripledes_ecb_crypt (ctx, inbuf+bnum, outbuf+bnum, 1);
        bnum += 8;
    }

    if (len - bnum != 8) return -1;
    tripledes_ecb_crypt (ctx, inbuf+bnum, buf, 1);
    padlen = buf[7];
    if (padlen == 0 || padlen > 8)
        return -1;

    if (memcmp(&buf[8-padlen], PADDING[padlen], padlen) != 0) {
        return -1;
    }
    memcpy(outbuf+bnum, buf, 8-padlen);
    bnum += 8 - padlen;

    *poutlen = bnum;
    return 0;
}



/*******************************************************************/


/*
 * Performs a selftest of this DES/Triple-DES implementation.
 * Returns an string with the error text on failure.
 * Returns NULL if all is ok.
 */
const s8 * selftest (void)
{
  /*
   * Check if 'u32' is really 32 bits wide. This DES / 3DES implementation
   * need this.
   */
  if (sizeof (u32) != 4)
       return "Wrong word size for DES configured.";

  /*
   * DES Mas32enance Test
   */
  {
    s32 i;
    u8 key[8] =
    {0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55};
    u8 input[8] =
    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
    u8 result[8] =
    {0x24, 0x6e, 0x9d, 0xb9, 0xc5, 0x50, 0x38, 0x1a};
    u8 temp1[8], temp2[8], temp3[8];
    struct _des_ctx des;

    for (i = 0; i < 64; ++i)
      {
    des_setkey (&des, key);
    des_ecb_encrypt (&des, input, temp1);
    des_ecb_encrypt (&des, temp1, temp2);
    des_setkey (&des, temp2);
    des_ecb_decrypt (&des, temp1, temp3);
    memcpy (key, temp3, 8);
    memcpy (input, temp1, 8);
      }
    if (memcmp (temp3, result, 8))
      return "DES mas32enance test failed.";
  }


  /*
   * Self made Triple-DES test    (Does somebody known an official test?)
   */
  {
    s32 i;
    u8 input[8] = {0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10};
    u8 key1[8] = {0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0};
    u8 key2[8] =    {0x11, 0x22, 0x33, 0x44, 0xff, 0xaa, 0xcc, 0xdd};
    u8 result[8] = {0x7b, 0x38, 0x3b, 0x23, 0xa2, 0x7d, 0x26, 0xd3};

    TripleDesCtx des3;

    for (i = 0; i < 16; ++i)
    {
      tripledes_set2keys (&des3, key1, key2);
      tripledes_ecb_encrypt (&des3, input, key1);
      tripledes_ecb_decrypt (&des3, input, key2);
      tripledes_set3keys (&des3, key1, input, key2);
      tripledes_ecb_encrypt (&des3, input, input);
    }
    if (memcmp (input, result, 8))
      return "Triple-DES test failed.";
  }

    /*
     * More Triple-DES test.  These are testvectors as used by SSLeay,
     * thanks to Jeroen C. van Gelderen.
     */
    {
        struct { 
            u8 key[24]; 
            u8 plain[8]; 
            u8 cipher[8]; 
        } testdata[] = {
            { { 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
                0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
                0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01  },
              { 0x95,0xF8,0xA5,0xE5,0xDD,0x31,0xD9,0x00  },
              { 0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00  }
            },
            { { 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
                0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
                0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01  },
              { 0x9D,0x64,0x55,0x5A,0x9A,0x10,0xB8,0x52, },
              { 0x00,0x00,0x00,0x10,0x00,0x00,0x00,0x00  }
            },
            { { 0x38,0x49,0x67,0x4C,0x26,0x02,0x31,0x9E,
                0x38,0x49,0x67,0x4C,0x26,0x02,0x31,0x9E,
                0x38,0x49,0x67,0x4C,0x26,0x02,0x31,0x9E  },
              { 0x51,0x45,0x4B,0x58,0x2D,0xDF,0x44,0x0A  },
              { 0x71,0x78,0x87,0x6E,0x01,0xF1,0x9B,0x2A  }
            },
            { { 0x04,0xB9,0x15,0xBA,0x43,0xFE,0xB5,0xB6,
                0x04,0xB9,0x15,0xBA,0x43,0xFE,0xB5,0xB6,
                0x04,0xB9,0x15,0xBA,0x43,0xFE,0xB5,0xB6  },
              { 0x42,0xFD,0x44,0x30,0x59,0x57,0x7F,0xA2  },
              { 0xAF,0x37,0xFB,0x42,0x1F,0x8C,0x40,0x95  }
            },
            { { 0x01,0x23,0x45,0x67,0x89,0xAB,0xCD,0xEF,
                0x01,0x23,0x45,0x67,0x89,0xAB,0xCD,0xEF,
                0x01,0x23,0x45,0x67,0x89,0xAB,0xCD,0xEF  },
              { 0x73,0x6F,0x6D,0x65,0x64,0x61,0x74,0x61  },
              { 0x3D,0x12,0x4F,0xE2,0x19,0x8B,0xA3,0x18  }
            },
            { { 0x01,0x23,0x45,0x67,0x89,0xAB,0xCD,0xEF,
                0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
                0x01,0x23,0x45,0x67,0x89,0xAB,0xCD,0xEF  },
              { 0x73,0x6F,0x6D,0x65,0x64,0x61,0x74,0x61  },
              { 0xFB,0xAB,0xA1,0xFF,0x9D,0x05,0xE9,0xB1  }
            },
            { { 0x01,0x23,0x45,0x67,0x89,0xAB,0xCD,0xEF,
                0x55,0x55,0x55,0x55,0x55,0x55,0x55,0x55,
                0xFE,0xDC,0xBA,0x98,0x76,0x54,0x32,0x10  },
              { 0x73,0x6F,0x6D,0x65,0x64,0x61,0x74,0x61  },
              { 0x18,0xd7,0x48,0xe5,0x63,0x62,0x05,0x72  }
            },
            { { 0x03,0x52,0x02,0x07,0x67,0x20,0x82,0x17,
                0x86,0x02,0x87,0x66,0x59,0x08,0x21,0x98,
                0x64,0x05,0x6A,0xBD,0xFE,0xA9,0x34,0x57  },
              { 0x73,0x71,0x75,0x69,0x67,0x67,0x6C,0x65  },
              { 0xc0,0x7d,0x2a,0x0f,0xa5,0x66,0xfa,0x30  }
            },
            { { 0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
                0x80,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
                0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x02  },
              { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00  },
              { 0xe6,0xe6,0xdd,0x5b,0x7e,0x72,0x29,0x74  }
            },
            { { 0x10,0x46,0x10,0x34,0x89,0x98,0x80,0x20,
                0x91,0x07,0xD0,0x15,0x89,0x19,0x01,0x01,
                0x19,0x07,0x92,0x10,0x98,0x1A,0x01,0x01  },
              { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00  },
              { 0xe1,0xef,0x62,0xc3,0x32,0xfe,0x82,0x5b  }
            }
        };

    u8        result[8];
    s32        i;
    static s8    error[80];
    TripleDesCtx    des3;

    for (i=0; i < (s32)(sizeof(testdata)/sizeof(*testdata)); ++i) {
        tripledes_set3keys (&des3, testdata[i].key, testdata[i].key + 8, testdata[i].key + 16);

        tripledes_ecb_encrypt (&des3, testdata[i].plain, result);
        if (memcmp (testdata[i].cipher, result, 8)) {
            sprintf (error, "Triple-DES SSLeay test pattern no. %d failend on encryption.", i+1);
            return error;
        }

        tripledes_ecb_decrypt (&des3, testdata[i].cipher, result);
        if (memcmp (testdata[i].plain, result, 8)) {
            sprintf (error, "Triple-DES SSLeay test pattern no. %d failend on decryption.", i+1);
            return error;
        }
    }
    }

  /*
   * Check the weak key detection. We simply assume that the table
   * with weak keys is ok and check every key in the table if it is
   * detected... (This test is a little bit stupid)
   */
  {
    s32 i;

    for (i = 0; i < 64; ++i)
    if (!is_weak_key(weak_keys[i]))
        return "DES weak key detection failed";
  }

  return 0;
}


s32 do_tripledes_setkey ( struct _tripledes_ctx *ctx, u8 *key, u32 keylen )
{
    if( selftest_failed )
        return DESE_SELFTEST_FAILED;
    if( keylen != 24 )
        return DESE_WRONG_KEYLEN;

    tripledes_set3keys ( ctx, key, key+8, key+16);

    if( is_weak_key( key ) || is_weak_key( key+8 ) || is_weak_key( key+16 ) ) {
        burn_stack (64);
        return DESE_WEAK_KEY;
    }
    burn_stack (64); 

    return 0;
}


void do_tripledes_encrypt( struct _tripledes_ctx *ctx, u8 *outbuf, u8 *inbuf )
{
    tripledes_ecb_encrypt ( ctx, inbuf, outbuf );
    burn_stack (32);
}

void do_tripledes_decrypt( struct _tripledes_ctx *ctx, u8 *outbuf, u8 *inbuf )
{
    tripledes_ecb_decrypt ( ctx, inbuf, outbuf );
    burn_stack (32);
}


/****************
 * Return some information about the algorithm.  We need algo here to
 * distinguish different flavors of the algorithm.
 * Returns: A pos32er to string describing the algorithm or NULL if
 *        the ALGO is invalid.
 */
const s8 *
des_get_info(size_t *keylen,
           size_t *blocksize, size_t *contextsize,
           s32    (**r_setkey)( void *c, u8 *key, u32 keylen ),
           void (**r_encrypt)( void *c, u8 *outbuf, u8 *inbuf ),
           void (**r_decrypt)( void *c, u8 *outbuf, u8 *inbuf )
         )
{
    static s32 did_selftest = 0;
 
    if( !did_selftest ) {
      const s8 *s = selftest();
      did_selftest = 1;
      if( s ) {
        fprintf(stderr,"%s\n", s );
        selftest_failed = s;
        return NULL;
      }
    }

    *keylen = 192;
    *blocksize = 8;
    *contextsize = sizeof(struct _tripledes_ctx);
    *(s32  (**)(struct _tripledes_ctx*, u8*, u32))r_setkey
                            = do_tripledes_setkey;
    *(void (**)(struct _tripledes_ctx*, u8*, u8*))r_encrypt
                            = do_tripledes_encrypt;
    *(void (**)(struct _tripledes_ctx*, u8*, u8*))r_decrypt
                            = do_tripledes_decrypt;
    return "3DES";
}


}

